電流によるキラル反鉄磁石の垂直の完全な切り替え
Tomoya Higo1,2, Kouta Kondou2,3, Takuya Nomoto4,5
1Department of Physics, University of Tokyo, Bunkyo-ku, Tokyo, Japan.
Nature
|July 21, 2022
まとめ
研究者は,Mn3Snでスピン軌道トルクを使用して,反鉄磁気バイナリ状態の完全な電気スイッチングを達成しました. この反鉄磁性スピントロニクスの突破は,将来の技術のための磁性命令の効率的な制御を可能にします.
科学分野:
- 凝縮物質物理学
- 材料科学
- スピントロニクス
背景:
- 電磁力の制御は,情報技術とスピントロニクスにとって非常に重要です.
- スピン・オービト・トルクは,磁気順序を操作するための効率的な方法を提供します.
- 反鉄磁気スピントロニクスは 高密度統合と超高速動作を約束します
研究 の 目的:
- 反鉄磁気バイナリ状態の垂直と完全なスピン軌道トルクスイッチングを実験的に実証する.
- クイラル反鉄磁石Mn3Snのスピントロニクス応用の可能性を調査する.
- 反鉄磁気システムのスピン軌道トルクの効率を調査する.
主な方法:
- 分子ビームエピタキシを用いた重金属/Mn3Snヘテロ構造の製造.
- 垂直磁性アニソトロピーの導入は,上軸張力による.
- 異常なホール効果を利用して 反鉄磁気状態のスイッチングを 読み出す
主要な成果:
- 30nm Mn3Snフィルムで垂直八極極の100%のスイッチングが実証されました.
- 15MA/cm2未満の臨界電流密度でスイッチングを達成した.
- 理論分析は,垂直幾何学による最大回転軌道トルク効率を確認した.
結論:
- この研究は,反鉄磁気バイナリ状態での完全なスピン軌道トルクスイッチングの実験的実現を提供します.
- この発見は,反鉄磁気スピントロニクスの進歩のための重要な基礎を確立します.
- 抗鉄磁気秩序の効率的な電気制御が達成され,新しいメモリと計算装置の道を開く.
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